1922.] W. M. Tattersaix : Indian Mysidacea. 477 



and there widening and terminating in two broad lobes separated 

 by a median wide cleft, about one-fifth of the length of the 

 whole telson ; margins of the cleft unarmed except for two long plu- 

 mose setae at the anterior end ; margins armed throughout their 

 entire length with spines ; about seventeen small spines on the 

 proximal part of the margin from the base of the telson to the 

 narrowest part ; from the narrowest part to the apex of each lobe 

 there are about twenty-five closely packed spines, longer than those 

 on the proximal portion of the margin and increasing in size to- 

 wards the apex. 



Inner uropod about one and a half times as long as the telson 

 with a very prominent spine on the dorsal surface of the stato- 

 cyst, towards the outside ; this spine is very prominent in lateral 

 view ; inner margin armed with a dense row of spines throughout 

 its length from the statocyst to the apex, the spines arranged in 

 series of larger and smaller ones, three to four in each series. 



Outer uropod twice as long as the telson. 



Female with three pairs of incubatory lamellae. 



Genus Dioptromysis Zimmer. 

 Dioptromysis perspicillata Zimmer. 



Dioptromysis perspicillata, Zimmer, 1915 (3), p. 168, text-figs. 20-22. 



Localities. — Port Blair, Andaman Islands. 

 St. 3. Five females, one male. 

 St. n. One male. 



Pamban, Gulf of Manaar, from weeds, 0-2 fathoms, February, 

 1913. Nine females, one male. 



Kilakarai, Gulf of Manaar, from weeds, 0-2 fathoms, February, 

 1913. Nine females, three males. 



Remarks — The largest female measured 5 mm., and the 

 largest male, 3-5 mm. The discovery of male specimens allows of 

 the proper classification of this species. It belongs to the tribe 

 Leptomvsini. The pleopods of the male agree generally with those 

 of the genus Leplomysis. The exopod of the fourth pair is longer 

 than the endopod, composed of six joints, the last one terminating 

 in a single thick plumose spine, equal in length to the last four joints 

 of the exopod, at the bnse of which is a small smooth spine. 

 The endopod of the fourth pair and the exopods and endopods 

 of the other pleopods are four jointed. 



Distribution. — The only known record is of a female taken on 

 a voyage from Ceylon to New Guinea. 



Genus Doxomysis Hansen. 



This genus was established by Hansen (19 12) for a species, 

 D. pelagica, captured off the Galapagos Islands. Illig, however, 

 in 1906, had described a species, " My sis " quadrispinosa, which 

 is clearly referable to this genus, though as Illig had only a single 

 female specimen at his disposal, he did not feel justified in 



